Screed expansion joint



May 12, 1959 D. M. BARTHOLOW ETAL 2,885, 39

SCREED EXPANSION JOINT Filed July 26, 1957 k INVENTORS D/YVE M 5419 /0L 014/, f /vey BOEMOL 11w,

United States, Patent SCREED EXPANSION JOINT Dave M. Bartholow, San Anselmo, and Henry Bormolini, Novato, Calif.

Application July 26, 1957, Serial No. 674,418

2 Claims. (CI. 94-18) This invention relates to floor or pavement construction, and more particularly to a floor or pavement structure of the concrete type provided with expansion joint elements.

A main object of the invention is to provide a novel and improved poured concrete floor structure which is simple in construction, which is easy to install, and which is so arranged that the various segments of the floor may be simultaneously poured without requiring the use of forms and without requiring the installation of individual expansion joints as the job progresses.

A further object of the invention is to provide an improved expansion joint structure for a concrete floor which is incorporated in the framing structure employed to form the floor, the structure being inexpensive to fabricate, greatly reducing the amount of time and labor involved in constructing a concrete floor and providing adequate expansion joints in the floor to allow necessary expansion and contraction thereof.

Further objects and advantages of the invention will become apparent from the following description and claims, and from the accompanying drawings, wherein:

Figure l is a perspective view of a portion of a concrete floor incorporating an improved expansion joint and screed structure according to the present invention.

Figure 2 is an enlarged vertical cross sectional view taken on line 2-2 of Figure 1.

Figure 3 is a fragmentary perspective view showing the elements of the screed and expansion joint member of Figures 1 and 2, shown in separated positions.

Figure 4 is a fragmentary perspective view showing a modified form of screed and expansion joint assembly which may be employed in place of that illustrated in Figures 1, 2 and 3.

Figure 5 is an enlarged fragmentary perspective view of a portion of one side of a floor segment framing assembly, as employed in Figure 1, and illustrating the manner in which the transverse anchor rods are mounted therein.

Referring to the drawings, and more particularly to Figures 1, 2, 3 and 5, 11 generally designates a concrete floor which is constructed in accordance with the present invention, and which employs an improved combination screed and framing assembly in accordance with this invention. The floor 11 comprises the spaced parallel longitudinal channel strips 12 and the spaced parallel transverse channel strips 13, identical in construction to the channel strips 12, which are transversely interlocked with the channel strips 12 to define a grid-like frame structure. Thus, the transversely interconnected channel strips 12 and 13 may be notched so that they can interlock with each other, for example, the upper portions of the channel strips 12 may be notched away and the lower portions of the channel strips 13 may be correspondingly notched away, so that the channel strips 13 may be lockingly interengaged with the channel strips 12 to define the transversely interengaged grid elements illustrated in Figure l.

2,885,939 Patented May 12, 1959 'ice The channel strips 12 and 13 are of identical construction, so that only one of said channel strips will be specifically described. Each channel strip comprises a flat horizontal top wall 15 and a pair of depending flanges 16 and 17. The depending flange 16 is substantially longer than the flange 17, and is formed at its bottom edge with the horizontally outwardly extending subflange 18. The short depending flange 17 is formed at its lower portion with downwardly and outwardly inclined sub-flange 19.

Disposed against the inside surface of the depending flange 16 is a filler plate 21 of relatively deformable material, such as cork or the like, being deformable to allow expansion of the concrete blocks on opposite sides thereof in the completed floor. A vertical anchor stake 22 is disposed between the plate member 21 and the depending flange 17, the combined thicknesses of the anchor stake 22 and the deformable plate member 21 being suificient to completely fill the space between the flanges 16 and 17, the top edge of the filler plate and the top end of the stake being received beneath and engaging the top wall of the channel strip, as is' clearly shown in Figure 2. A headed fastener member 23 extends through an aperture 24 formed in the upper portion of the stake member 22 and passes through the plate member 21 and through an aperture provided therefor in the flange 16, the ends of the headed fastener member 23 being bent over, as shown at 25, to retain the fastening member 23 in locking position, as shown in Figure 2. Thus, the fastening member 23 may comprise an ordinary nail whose end is bent over, as shown at 25, after the nail has been inserted to secure the members 22 and 21 in the downwardly facing channel strip.

As shown in Figure 5, a plurality of transversely extending anchor rods 26 are provided, said anchor rods extending through apertures 27 formed in the flanges 16 and extending substantial distances on opposite sides of said flanges, the anchor rods also passing through the filler plates 21.

After the framing assembly has been set up, the concrete, shown at 28 is poured into the rectangular spaces defined by the grid-like framing strocture, the concrete filling said rectangular spaces and being poured to a height substantially flush with the top wall 15 of the channel strips 12 and 13. After being suitably smoothed oif, the resulting floor structure comprises respective rectangular concrete blocks separated by the expansion joints defined by the deformable plate members 21 which are secured adjacent to the depending flange element 16 of the embedded channel strips.

Figure 4 illustrates a modification of the structure wherein loops of wire 30 are engaged through apertures 31 provided in the longer flanges of the channel strips, designated at 16 in Figure 4, the wire loops 30 extendmg around the anchor members 22 and passing through the intervening deformable filler plates 21. Thus, in the structure shown in Figure 4, the wire fastening loops 30 are substituted for the fastening members 23 shown in Figures 1, 2, 3 and 5.

While a specific embodiment of an improved expans1ou oint and screed structure for a concrete or similar type of poured floor or pavement has been disclosed in the foregoing description, it will be understood that various modifications within the spirit of the invention may occur to those skilled in the art. Therefore it is intended that no limitations be placed on the invention except as defined by the scope of the appended claims.

What is claimed is:

1. In a concrete floor, a plurality of longitudinally spaced sheet metal downwardly facing channel strips having flat horizontal top surfaces, a plurality of transverse spaced sheet metal downwardly facing channel strips disposed on said longitudinal strips and also having flat horizontal top surfaces, said strips interengaging with each other so that their top surfaces are substantially in the same horizontal plane, each strip having depending flanges, one of said flanges being substantially longer than the other and being formed at its bottom margin with an outwardly projecting sub-flange, the other flnage being inclined downwardly and outwardly at its lower margin, vertical anchor stakes disposed in the channel strips, filler plates disposed in the channel strips between the anchor stakes and the longer flanges, the top ends of the stakes and the top edges of the filler plates being received beneath and engaging the top walls of the channel strips, the upper portions of said anchor stakes and filler plates being of suflicient thickness to be snugly received between said depending flanges, and horizontal fastening members lockingly engaged with the anchor stakes, filler strips and longer flanges.

2. In a concrete floor, a plurality of longitudinally spaced sheet metal downwardly facing channel strips hav-.

with an outwardly projecting sub-flange, the other flange being inclined downwardlyand outwardly at its lower margin, vertical anchor stakes disposed in the channel strips, filler plates disposed in the channel strips between the anchor stakes and the longer flanges, the top ends of the stakes and the top edges of the filler plates being received beneath and engaging the top walls of the channel strips, the upper portions of the anchor stakes and filler plates being of suflicient thickness to be snugly received between said depending flanges, horizontal fastening members lockingly engaged with the anchor stakes, filler strips and longer flanges, and horizontal anchor rods extending through the intermediate portions of the longer flanges and filler plates and projecting substantial distances on opposite sides of said longer flanges and filler plates.

References Cited in the file of this patent UNITED STATES PATENTS FOREIGN PATENTS Great Britain May 1, 1935 

